wesslau



(No Model.)

13/: H. WESSLAU. ANTI-INDUOTIVE' CONDUCTOR.

No. 475,648. Patented May 24, 1892.

.QZO'

UNITED STATES PATENT OFFICE.

BROR HEMMING IVESSLAU, OF CI-IARLOTTENBURG, ASSIGNOR TO SIEMENS & HALSKE, OF BERLIN, GERMANY.

ANTI-INDUCTIVE CONDUCTOR.

SPECIFICATION forming part of Letters Patent No. 475,648, dated May 24, 1892.

Application filed January 21, 1892. Serial No. 418,825. (No model.)

To all whom it may concern.-

Be it known that I, BEoR HEMMING WESS- LAU, a subject of the King of Prussia, residing at the city of Charlottenlmrg, Prussia, Germany, have invented certain new and useful Improvements in Anti-Inductive Conductors; andIdo hereby declare the following to be a full, clear, and exact description of the invention, such as will enable others skilled in the [0 art to which it appertains to make and use the same.

My invention relates to flexible insulated electrical conductors, in the operation of which the charging phenomena play a materially disturbing part, and hence chiefly to cables which serve to transmit currents of changing intensity; and the object of my invention is to diminish the capacity of such conductors or cables.

As the capacity of an electrical conductor to a large extent depends on the selection of the insulating means, and air, of all insulating means,possesses the smallest constant of dielectrieity, the object desired is best at- :5 tained by flexible cables, in which between the supply and return conductors one or several air-strata are placed.

In the accompanying drawings, in which similar letters refer to similar parts through- ;0 out the several views, Figures 1 and 1 show one form of arranging the said conductors, and Figs. 2 and 2 represent another form.

In Figs. 1 and 1 the metallic conductor K, which may consist of bare wires or wires in- ;5 sulated in any way desired, is continuously wound around with such thread or rope F of any insulating materialhemp, cotton, silk, and the likeas possesses suitable cross-section dimensions. Over this thread F, then, the

to insulating-layerJisplaced so that it does not penetrate the interstices between the several coils of the thread F, but surrounds it in the form of a hollow cylinder, touching the outside of the thread-winding. The twist with ;5 which the thread F is wound upon the con-r or in the form of wire and the like spun eoncentrically to the core of the cable.

Figs. 2 and 2 show a somewhat diiiferent form of making the cable. In this form both the supply-conductor and the return-eonduetor are included in the same stratum of insulation J and both are plaited around with the thread F, so that they cannot touch each other or the insulating-stratum J.

The details of the form or manufacture of the conductor, of the insulatingstratum, and of the return-conductor are independent of my invention.

Instead of simply winding the thread F around the conductor K, in which case a displacement of the several windings of the thread might easily occur, the conductor, as shown in Figs. 2 and 2, may be plaited around with the thread F or be spun around in any other manner, but in each case so that the stratum given by the thickness of the thread and separating the conductor from the insulating material consists, essentially, of air and subsists between the supply-conductor and the return-conductor. Instead of a single airstratum, also, several such strata may be es- 230 tablished, if desired.

I claim as my invention- 1. An anti-inductive conductor having an open net-work of threads of insulating material wound or plaited thereon,with air-spaces between said threads, and an outer envelope of insulating material wound around the eX- terior of said threads and inclosing said threads and said air-spaces, substantially as and for the purposes described. 0

2. In an anti-inductive circuit, the combination, with a direct and a return conductor, of an open net-work of threads of insulating material wound or plaited around each of said conductors and between said conductors, leaving air-spaces between said threads, and an outer envelope of insulating material wound around the exterior of said threads and conjductors and leaving'said air-spaces between and around said conductors, substantially as I00 and for the purposes described.

In testimony whereof I have affixed mysignature in presence of two witnesses.

BROR HE MMING IVESSLAU. 

